Which telescope design innovation, first implemented in the James Webb Space Telescope, revolutionized space observation by allowing the primary mirror to be folded during launch?

The design of telescopes and astronomical instruments has evolved dramatically over centuries, with key innovations that have revolutionized how we observe the cosmos. Modern astronomical product design must balance cutting-edge technology, user accessibility, and the harsh conditions of space or remote observatories. This trivia question explores a significant innovation in telescope design that changed the industry. Test your knowledge about how product design has impacted our ability to study the stars!

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Segmented mirror technology with deployable sections
Liquid mirror technology using rotating mercury
Adaptive optics with real-time atmospheric correction
Carbon nanotube-reinforced single-piece mirrors